/*
 * Copyright 2007 Rob Nielsen
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * 	http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.googlecode.proxymatic.apps.autoboundary.handlers;

import com.googlecode.proxymatic.apps.autoboundary.AutoboundaryLookup;
import com.googlecode.proxymatic.core.AbstractMethodHandler;
import com.googlecode.proxymatic.core.BuildtimeContext;
import com.googlecode.proxymatic.core.MethodInvoker;
import com.googlecode.proxymatic.core.ProxyBuilder;
import com.googlecode.proxymatic.core.ReturnTypeModifier;
import com.googlecode.proxymatic.core.handlers.method.CheckingParameterModifier;
import com.googlecode.proxymatic.core.handlers.method.PassthroughMethodInvoker;
import com.googlecode.proxymatic.core.util.ReflectUtil;

import java.lang.reflect.Method;

public class AutoboundaryReverseMethodHandler extends AbstractMethodHandler {
    private final AutoboundaryLookup autoboundaryLookup;

    public AutoboundaryReverseMethodHandler(AutoboundaryLookup autoboundaryLookup) {
        this.autoboundaryLookup = autoboundaryLookup;
    }

    public MethodInvoker getInvoker(Method method, BuildtimeContext context, ProxyBuilder proxyBuilder) {
        if (!autoboundaryLookup.isAutoboundaryPair(context.getImplementationClass(), context.getTargetInterface())) {
            return NOT_HANDLED;
        }
        Class[] parameterTypes = method.getParameterTypes();
        AutoboundaryWrapperUnwrapper autoboundaryWrapperUnwrapper = new AutoboundaryWrapperUnwrapper(proxyBuilder, autoboundaryLookup);
        CheckingParameterModifier parameterModifier = new AutoboundaryReplaceWithAutoParameterTypeModifier(autoboundaryLookup, autoboundaryWrapperUnwrapper);
        ReturnTypeModifier returnModifier = new AutoboundaryReturnTypeModifier(autoboundaryLookup, autoboundaryWrapperUnwrapper);
        Method[] methods = ReflectUtil.getMethodsWithName(context.getImplementationClass(), method.getName());
        for (int i = 0; i < methods.length; i++) {
            Method destinationMethod = methods[i];
            if (returnModifier.supportsReturnType(method.getReturnType(), destinationMethod.getReturnType()) &&
                    parameterModifier.supportsParameterTypes(parameterTypes, destinationMethod.getParameterTypes())) {
                return new PassthroughMethodInvoker(destinationMethod, parameterModifier, returnModifier);
            }
        }
        return NOT_HANDLED;
    }
}
